Returns the Laguerre series coefficients c differentiated m times
along axis. At each iteration the result is multiplied by scl (the
scaling factor is for use in a linear change of variable). The argument
c is an array of coefficients from low to high degree along each
axis, e.g., [1,2,3] represents the series 1*L_0+2*L_1+3*L_2
while [[1,2],[1,2]] represents 1*L_0(x)*L_0(y)+1*L_1(x)*L_0(y)+2*L_0(x)*L_1(y)+2*L_1(x)*L_1(y) if axis=0 is x and axis=1 is
y.

Parameters:

c : array_like

Array of Laguerre series coefficients. If c is multidimensional
the different axis correspond to different variables with the
degree in each axis given by the corresponding index.

m : int, optional

Number of derivatives taken, must be non-negative. (Default: 1)

scl : scalar, optional

Each differentiation is multiplied by scl. The end result is
multiplication by scl**m. This is for use in a linear change of
variable. (Default: 1)

In general, the result of differentiating a Laguerre series does not
resemble the same operation on a power series. Thus the result of this
function may be “unintuitive,” albeit correct; see Examples section
below.